Single port coupler for resonance splitting in hearing aid



FIG. 1 is a side elevational view for a single port coupler for resonance splitting in hearing aids, showing my new design;

FIG. 2 is a rear elevational thereof;

FIG. 3 is a front elevational thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a single port coupler for resonance splitting in hearing aids, as shown. 